JEE Mains · Chemistry · STD 12 - 5. Co-ordination chemistry
The wavelength of light absorbed for the following complexes are in the order:
\(\underset{\text { (I) }}{\left[ Co \left( NH _3\right)_6\right]^{3+}} ; \underset{\text { (II) }}{\left[ Co \left( H _2 O \right)_6\right]^{3+}} ; \underset{\text { (III) }}{\left[ Co ( CN )_6\right]^{3-}}\) ;
\(\underset{( IV )}{\left[ Co \left( NH _3\right)_5\left( H _2 O \right)\right]^{3+}} ; \underset{( V )}{\left[ CoF _6\right]^{3-}}\)
- A III < I < II < IV < V
- B III < I < IV < V < II
- C III < IV < I < II < V
- D III < I < IV < II < V
Answer & Solution
Correct Answer
(D) III < I < IV < II < V
Step-by-step Solution
Detailed explanation
Wavelength of light absorbed increases as C.F.S.E of complex decreases. \([Co(CN)_{6}]^{3-}\) has maximum CFSE \([CoF_{6}]^{3-}\) has least CFSE Ligand field strength\(\uparrow\) ; C.F.S.E\(\uparrow\) Correct wavelength order : V > II > IV > I > III
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